This list of current cities, towns, unincorporated communities, counties, and other recognized places in the U.S. state of Idaho also includes information on the number and names of counties in which the place lies, and its lower and upper ZIP Code bounds, if applicable.
| Name of place | Number of counties | Principal county | Lower ZIP Code | Upper ZIP Code |
|---|---|---|---|---|
| Oakley | 1 | Cassia County | 83346 | |
| Obsidian | 1 | Custer County | 83340 | |
| Oden | 1 | Bonner County | ||
| Ola | 1 | Gem County | 83657 | |
| Old Beaver | 1 | Clark County | ||
| Old Fort | 1 | Valley County | ||
| Old Golden | 1 | Idaho County | ||
| Oldtown | 1 | Bonner County | 83822 | |
| Olsen | 1 | Bingham County | ||
| Omega | 1 | Benewah County | ||
| Omill | 1 | Clearwater County | ||
| Onaway | 1 | Latah County | 83855 | |
| Orchard | 1 | Ada County | 83707 | |
| Orchard Station | 1 | Ada County | 83704 | |
| Oreana | 1 | Owyhee County | 83650 | |
| Orofino | 1 | Clearwater County | 83544 | |
| Orogrande | 1 | Idaho County | 83525 | |
| Orvin | 1 | Bonneville County | ||
| Osburn | 1 | Shoshone County | 83849 | |
| Osgood | 1 | Bonneville County | 83401 | |
| Outlet Bay | 1 | Bonner County | ||
| Ovid | 1 | Bear Lake County | 83260 | |
| Owinza | 1 | Lincoln County | ||
| Owyhee | 1 | Ada County | ||
| Owyhee Heights | 1 | Owyhee County | ||
| Oxford | 1 | Franklin County | 83263 | |
| Name of place | Number of counties | Principal county | Lower ZIP Code | Upper ZIP Code |
|---|---|---|---|---|
| Quartzburg | 1 | Boise County | ||
| Quigley | 1 | Power County | ||
| Name of place | Number of counties | Principal county | Lower ZIP Code | Upper ZIP Code | |
|---|---|---|---|---|---|
| Ucon | 1 | Bonneville County | 83454 | ||
| Ulysses | 1 | Lemhi County | |||
| Underkoflers Corner | 1 | Canyon County | |||
| Unity | 1 | Cassia County | 83318 | ||
| University | 1 | Latah County | 83843 | ||
| Ustick | 1 | Ada County | 83704 |
| Name of place | Number of counties | Principal county | Lower ZIP Code | Upper ZIP Code |
|---|---|---|---|---|
| Valley View Heights | 1 | Nez Perce County | 83501 | |
| Vans Corner | 1 | Bonner County | ||
| Vassar | 1 | Latah County | ||
| Vay | 1 | Bonner County | ||
| Vernon | 1 | Ada County | 83455 | |
| Victor | 1 | Teton County | 83455 | |
| View | 1 | Cassia County | 83318 | |
| Viola | 1 | Latah County | 83872 | |
| Virginia | 1 | Bannock County | 83234 | |
| Name of place | Number of counties | Principal county | Lower ZIP Code | Upper ZIP Code | |
|---|---|---|---|---|---|
| Yale | 1 | Latah County | |||
| Yellowjacket | 1 | Lemhi County | |||
| Yellow Pine | 1 | Valley County | 83677 | ||
| Yellowstone National Park | 1 | Fremont County | 82190 |
| Name of place | Number of counties | Principal county | Lower ZIP Code | Upper ZIP Code |
|---|---|---|---|---|
| Zaza | 1 | Nez Perce County | ||
| Zenda | 1 | Bannock County | ||